The application of kinetic models of pseudo _rst and second order for the description of experimental kinetic data related to the adsorption of uorine ions on trepel modi_ed by aluminum compounds (TMA) is discussed in this work. The pseudo-_rst-order kinetic model is expressed as [1]: dat dt = k1(am - at) (1) Integrating within the boundary conditions t = 0 to t =  t and att = 0 to at = am gives the linearized form as ln (am - at) = ln am - k1t (2) The pseudo-second order Mackay and Ho model [2] is expressed as dat dt = k1(am - at)2 (3) Rearranging and integrating Eq. (3) with respect to the boundary conditions t = 0 to t = t and at = 0 to at = am gives the linearized form as t at = 1 k2 a2 m + t am (4) where am and at[mmol=g] are the the amounts of uoride ions adsorbed at equilibrium at time t, respectively; k1[min-1] is the pseudo-_rst-order rate constant and k2[mmol=(g min] is the rate constant of the pseudo-second order kinetics. Employing the linearized form of pseudo-_rst-order model (ln (am - at) = f(t), Eq. (2)) and linearized form of pseudo-second-order model (t=at, versus contact time (t), Eq. (4)) we determined the constants k1; k2, and am values using the slopes and intercept points of the linear plots. The results are illustrated in Table.1.